666006310997 has 2 divisors, whose sum is σ = 666006310998. Its totient is φ = 666006310996.

The previous prime is 666006310919. The next prime is 666006310999. The reversal of 666006310997 is 799013600666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 358742300401 + 307264010596 = 598951^2 + 554314^2 .

It is a cyclic number.

It is not a de Polignac number, because 666006310997 - 2²² = 666002116693 is a prime.

Together with 666006310999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666006310999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333003155498 + 333003155499.

It is an arithmetic number, because the mean of its divisors is an integer number (333003155499).

Almost surely, 2^666006310997 is an apocalyptic number.

It is an amenable number.

666006310997 is a deficient number, since it is larger than the sum of its proper divisors (1).

666006310997 is an equidigital number, since it uses as much as digits as its factorization.

666006310997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2204496, while the sum is 53.

The spelling of 666006310997 in words is "six hundred sixty-six billion, six million, three hundred ten thousand, nine hundred ninety-seven".